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(inorganic chemistry)
H3 As A colorless, highly poisonous gas with an unpleasant odor.



AsH3, a colorless, odorless gas (impurities usually produce an odor of garlic). Boiling point, —62.4°C; melting point, -113.5°C. Discovered in 1775 by K. W. Scheele. Pure arsine is produced by the action of water on sodium arsenide, Na3As. The reduction of acid-soluble arsenic compounds by hydrogen results in the formation of a mixture of arsine and hydrogen at the moment of liberation—for example:

As2O3 + 6Zn + 6H2SO4 = 2AsH3 + 6ZnSO4 + 3H2O

If the mixture is passed through a glass tube heated to 400°-500°C, the arsine will decompose into hydrogen and arsenic, which forms a black film with a vitreous luster along the cool sections of the tube. The test is used to determine the presence of arsenic in various substances; it was developed in 1836 by the English chemist J. Marsh (1794–1846).

Arsine is one of the most poisonous commercial toxins known. It generally induces acute poisoning. It has a primarily hemolytic effect. The latent period lasts two to eight hours, toward the end of which headache, dizziness, rigor, vomiting, and abdominal pain occur. The skin takes on a sunburned appearance, and body temperature initially rises to 38°-39°C. The patient may go into a coma after a certain period of time. Preventive measures against arsine poisoning include the use of arsenic-free metals and acids, the mechanization of production processes, the sealing of industrial equipment, and the creation of an effective ventilation system.

References in periodicals archive ?
One generates arsine at sub-atmospheric pressure from an electrochemical generator housed in the cylinder.
While arsine itself is odorless, owing to its oxidation by air it is possible to smell a slight, garlic-like scent when the compound is present at about 0.
Freezing points of chemical agents Agent Symbol Contact Hazard Vapor Hazard Nerve Tabun GA Extreme Low-Moderate Sarin GB Extreme Extreme Soman GD Extreme Probable VX Extreme Negligibe VR-55 Extreme Probable TGD Extreme Probable Blister Distilled mustard HD Extreme Negligibe Mustard-lewisite HL Extreme Low Nitrogen mustard HN-1 Extreme Low Nitrogen mustard HN-2 Extreme Low Lewisite L Extreme Negligible Nitrogen mustard HN-3 Extreme Low Phosgene oxime CX Extreme Low Blood Hydrogen cyanide AC Low Extreme Cyanogen choride CK Low Extreme Arsine SA Low Extreme Choking Phosgene CG Slight Extreme Diphosgene DP Slight Extreme Table 2.
Praxair also supports the Taiwan region with an operations center located near the Tainan Science Park, which offers technical support as well as just-in-time delivery of such products as silane, ammonia, phosphine, arsine, and nitrogen trifluoride.
Manufacturing both cadmium- and a-Si-based PV materials typically involves depositing angstrom-thick layers of gases such as arsine, phosphine, and silane onto a substrate.
April 25 when he allegedly rear-ended a car driven by Arsine Sahverdiyan of Worcester, who was stopped at a red light.
The study team carried out hydrochemical analyses for the quantitative determination of arsenic in the laboratory by means of the electrometer method, using a selective electrode and the arsine test technique.
The production expansion of our UpTime product line will more than double our capacity for the three primary dopant gases: arsine, phosphine and enriched boron triflouride," said Ray Roberge, president of Praxair Electronics.
The driver of the second car, Arsine Sahverdiyan of Worcester, was pulled out of her vehicle by passers-by after it burst into flames.
The PiMFC's multi-gas, multi-range feature allows users to configure it for different primary implant gases such as arsine, phosphine, boron trifluoride and others, keeping inventory costs down.
minimal ability to test the public for exposure to chemicals, including common industrial chemicals such as phosgene, a choking agent regularly used in pharmaceuticals, metal welding and dye manufacturing, and arsine, a blood agent used in the manufacturing of computer chips and fiber optics.
Study on wet digestion method for determination of total arsenic in marine organisms by continuous flow arsine generation and atomic absorption spectrometry using some model compounds.